Originally Posted by k0nr4d

Nope. The costs to make a site like say a tube, a blog, whatever are relatively low. Scripts, designs, hosting aren't really all that much money. If someone was able to effectively rank a site, they'd make their own and rank theirs instead of doing it for pocket-change for someone else, and even if they were to do it as a side project - they wouldn't help competition.

As for if it's his fault? I doubt it. Googles algo isn't a static thing. It's constantly changing and it's enough that they changed something in their algo causing you to de-rank despite yours or his best efforts.